Recent Surface Faulting Events along the Middle Section of the Itoigawa-Shizuoka Tectonic Line: Trenching Survey of the Gofukuji Fault near Matsumoto, Central Japan@@@牛伏寺断層・松本市並柳地区トレンチ発掘調査
Recent Surface Faulting Events along the Middle Section of the Itoigawa-Shizuoka Tectonic Line: Trenching Survey of the Gofukuji Fault near Matsumoto, Central Japan@@@牛伏寺断層・松本市並柳地区トレンチ発掘調査
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最近糸鱼川-静冈构造线中段的地表断层事件：日本中部松本附近吴福寺断层的挖沟调查
DOI：
10.4294/zisin1948.46.4_425
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发表时间：
1994
期刊：
影响因子：
--
通讯作者：
E. Tsukuda
中科院分区：
文献类型：
--
作者：
K. Okumura;K. Shimokawa;H. Yamazaki;E. Tsukuda
日本中部的Itoigawa-Shizuoka构造线中段（Middle ISTL）是一个活动断层系统，从松本到Kobuchizawa，从西北向东南延伸50 km。ISTL中期的特征是在晚更新世和全新世期间，平均滑动速率高达8 - 10 mm/a。这是日本陆上活动断层滑动速率最高的记录之一。滑动率与复发时间之间的经验关系表明，ISTL中期可能在一千年内破裂一次以上。先前已知的复发时间估计为3500至5000年，明显长于预期的复发时间。ISTL中段的最后一次断裂事件可能发生在841 A。D.根据历史记载和古地震学研究，由于过去的时间是大约1152年，估计复发时间是至关重要的，以评估未来的地震的潜力。为了了解最近断层活动的历史，我们挖掘了位于松本以南的Namiyanagi的ISTL中段最北端的Gofukuji断层。通过对6个沟槽、3个测试坑和沟槽周围地形的调查，得出以下结果。最近的三次断裂事件的年龄为公元445-1386年，公元150-334年，和公元前839-189年，重现时间在111 - 1236年之间。假设最后一次事件与公元841年事件的相关性，估计复发时间为338至1172年。这种情况下的平均复发间隔为515至840年。607年至1152年的流逝时间可能比重现时间更长。自1980年以来断层的平均滑动速率为1.25 × 10 ~（-3）m ~ 2。公元前6000年是9.4.5毫米/年的左侧。最后一次地震的左行同震滑动估计为7.51.5m。
The middle section of the Itoigawa-Shizuoka Tectonic Line (Middle ISTL) is an active fault system that extends NW-SE for 50 km from Matsumoto to Kobuchizawa, in central Japan. The Middle ISTL is characterized by high average slip-rate reaching 8 to 10 mm/yr during the Late Pleistocene and Holocene. This is one of the highest slip-rate reported from active faults on land in Japan. Empirical relation between slip-rate and recurrence time indicates that the Middle ISTL may rupture more than once a thousand year. The previously known recurrence time estimates of 3500 to 5000 years were significantly longer than the expected recurrence time. The last faulting event on the Middle ISTL most likely occurred in 841 A. D. according to historic record and paleoseismological works. Since the elapsed time is about 1152 years, the estimation of recurrence time is critical to evaluate the potential of next earthquake. In order to know the history of recent faulting events, we excavated the Gofukuji fault, the northernmost segment of the Middle ISTL at Namiyanagi, south of Matsumoto. Investigation of 6 trenches, 3 test pits and topography around the trenches brought following results. The ages of three most recent faulting events are 445-1386 A.D., 150-334 A.D., and 839-189 B.C. The recurrence time is between 111 and 1236 years. Assuming the correlation of the last event with the 841 A.D. event, the recurrence time is estimated to be 338 to 1172 years. Average recurrence interval in this case ranges 515 to 840 years. The elapsed time of 607 to 1152 years is probably longer than the recurrence time. The average slip rate of the fault since c.a. 6000 B.C. is 9.4.5 mm/yr left-lateral. The left-lateral coseismic slip during the last event is estimated as 7.51.5 m.
影响因子：
8.3
作者：
M. Stuiver;G. Pearson
通讯作者：
M. Stuiver;G. Pearson